Hongsheng Zhang and Zong-Hong Zhu JCAP03(2008)007 doi:10.1088/1475-7516/2008/03/007
Hongsheng Zhang1,2 and Zong-Hong Zhu2
Show affiliationsRecent direct H(z) data indicate that the parameter H(z) may wiggle with respect to z. On the other hand, the luminosity distance data of supernovae flatten the wiggles of H(z) because of the integration effect. It is expected that the fitting results can be different in a model permitting a wiggling H(z) because the data of supernovae are degenerate in such a model. As an example the natural phantom dark energy is investigated in this paper. The dynamical property of this model is studied. The model is fitted by the direct H(z) dataset and the SNLS dataset, respectively. The results are rather different, as expected. The quantum stability of this model is also briefly discussed. We find that it is a viable model if we treat it as an effective theory truncated by an upper bound.
97.10.Ri Luminosities; magnitudes; effective temperatures, colors, and spectral classification
Issue 03 (March 2008)
Received 29 November 2007, accepted for publication 19 February 2008
Published 10 March 2008
Hongsheng Zhang and Zong-Hong Zhu JCAP03(2008)007
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